Apparatus for forming abrading-wheels



(No Model.) A

W. H. TAGGART. APPARATUS FOR FORMING ABRADING WHEELS.

No. 395,365. Patented Jan. 1, 1889.

NITED STATES rricn.

PAFNT APPARATUS FOR FORMING ABRADING WHEELS.

SPECIFICATION forming part of Letters Patent No. 395,365, dated. January1, 1889..

Serial No. 253,671. (No model.)

To aZZ whom it may concern.-

Be it known that I, \VILLIAM ll. TAGGART, a resident of Freeport, in thecounty of Stephenson and State of Illinois, have invented certain newand useful Improvementsin Apparatus for Forming Abrading-\Vl1eels; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it pertains to make and use the same.

My invention is an improved device for forming abrading wheels orcutters directly upon their shafts. It fully illustrated in theaccompanying drawings, in which-- Figure 1. shows a side view of theentire apparatus. Fig. 2 is a view in the direction of the arrow ofFig. 1. Fig. 3 is an enlarged section on the line 1 Fig. 1. Fig. 4C is asection on. the line :r'y, Fig. Fig. 5 is a section similar to thoseshown in Figs. and 4, illustrating a slight modification inconstruction, for purposes hereinafter set forth.

In the drawings, A A are handles, and 'D I) are corresponding jawspivoted together at U and thrown open by a spring, 13, in the usualmanner. The jaws are perfm'ated, and in them are )laced, respectively, asteel ma trix, If, and a steel pressm'ebloclt, G. Both matrix and blockare n-ovided with shoulders resting upon the face of the jaws,respectively, and with integral] formed shafts .T K, fitting theperforations in the jaws. The inner surface of the block is plane and atright angles to the axis of the shaft K, which, when the forceps areclosed, as shown, is in line with the axis of thcmatrix II and its shaftJ'. The inner end of the matrix-head H is provided with a recess of theform desired for the emery-wluml, and is beveled from the outside towardthis recess to :form a sharp cuttingedge, all whose points may meet theface of the block G when the forceps are closed, the (-m1structi0n ofthe jaws being such that in this position their inner faces are at adistance from each other just equal to the combined lengths of the blockG and matrix II, exclusive of their shafts.

The shaft .T is centrally perforated in the direction of its length, andin this perforation placed a shaft, I, whose roughened end porface ofthe block (it.

tion, P, projects to any desired distance into the depression L in thematrix-heenl II. A set-screw, F, working in the jaw I), passes through asuitable opening in the shaft J and secures the shaftI in any desiredposition, and a set-screw, F, in like manner fastens the shaft K. If,now, a piece of an emery or corundum wheel, or of any similar substance,be warmed until it reaches a plastic state and be then placed in thematrix, closing the forceps will :force itinto every part of the recess,including the slight depressions in the surface of the shaft I, and thesurplus material, if there be any, will be neatly and cleanly separatedfrom the portion within the matrix by the cutting-edge as the lattermeets the sur- The mass being then cooled afterward removed from thematrix as a perfect disk perfectly mounted upon the shaftI and ready foruse in the dental cngine.

It is plain thatnmtriees of any desired form may replace thefrusio-conical matrix shown, and that the face of the block G may beprovided with a depression or projection of such form that the outerface of the completed wheel may be jn'ojecting or re-entrant, and,further, it is evident that a great vi'iriety of matrices. may be usedwithout sul'istituting another block for the plane-'facml block G,(shown in the drawings) the size of the wheel to be formed being limitedonly by the size of the plane pressure-surfacc.

For some purposes it is necessary that the portion of the shaft Incarthc cutter or wheel mounted upon-it be much smaller than it ispracticable to make the body thereof, it being desirable that the entireseries of wheels may be used in the same shaft-llo'lder. Twodifficulties are then presented; The shaft is too small to. affordsecure attachment for the wheel, and the material of which the wheel isformed is forced into the space surrounding the small portion of theshaft and must be removed after the wheel is completed. The

shaft is therefore provided with an end disk, 0, Fig. 5, at least equalin diameter to the diameter of the main portion of the shaft, and this,whatever the form of the matrix, ahvays covers or fills the perforationin the bottom thereof and prevents the plastic substance from passinginto the space about the small portion of the shaft. It may be remarkedthat this space is necessary in order that the same matrix may be usedwith either shaft, and that the shaft may be removed longitudinally whenthe corundum disk has been formed upon its extremity. Making the jaw Din two parts attains one 011' these objects, but not the other.

I have forced the matrix and pressureblocks togeth er by various otherdeviees-e g., by a screw and by a cam moving" either one in the line ofits axis; but I prefer the method illustrated as essentially the same,but more convenient and rapid in operation.

Having now fully described and illustrated the construction andoperation of my invention, what I claim as new, and tiOSilO to seeure byLetters Patent, is

1. In a device for forming abradlug-wheels 1 directly upon their shalts,the combination, 1

with two eoaeting jaws, of a pressure-block attached to one of said jaws, a matrix attachml to the other jaw and having a cutting-edgeadapted to bear upon said pressure-block, and i an axial bore adapted toreceive a shaft, and

- means, substantially as shown and described, for securing a shaft inthe bore of said matrix during the formation of an abrading-wheel,sul'istantially as and-for the purpose set forth.

2. In an apparatus for forming abradingwheels directly upon theirshafts, the combination, with two suitably-bored coacting jaws, ot' apressure-block having a shank removably seated in the bore of one ofsaid jaws, an axially-bored matrix having a shank removably seated inthe other of said jaws and formed with a transverse opening, and atransverse set-serew seated in said last-named jaw and adapted to passthrough the transverse openingin the shank ef the matrix and to secure ashaft in said shanle and at thesametime to secure the shank in the jawin which it is seated, substantially as and for the purpose set lori h.

In testimony whereof I have signed this specification in the presence oftwo subscribingwitnesses.

WILLIAM ll. 'FAGGART.

\Yitncsses:

C. W. irRAHAM, G. H. Parrisom.

